50 years of Nikon F-mount – Nikkor-S 5 cm f/2 vs. Nikkor AF 50 mm f/1.8D
8. Vignetting
Nikkor AF 50 mm f/1.8D - f/1.8 | |
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Nikkor-S 5 cm f/2.0 - f/2.0 | Nikkor AF 50 mm f/1.8D - f/2.0 |
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Nikkor-S 5 cm f/2.0 - f/2.8 | Nikkor AF 50 mm f/1.8D - f/2.8 |
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Nikkor-S 5 cm f/2.0 - f/4.0 | Nikkor AF 50 mm f/1.8D - f/4.0 |
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Against such a background the Nikkor AF 50 mm f/1.8D looks more presentably. Although not much bigger, it is a bit faster and its light fall-off is significantly lower. At the maximum aperture the frame corner brightness loss is 41% (-1.54 EV). This value is not low but taking into account the fact that on full frame fast lenses can lose as many as 2-3 EV we really shouldn’t complain. By f/2.0 the vignetting amounts to 38% and by f/2.8 it decreases to 20%. By f/4.0 the aberration stops being a problem as it reaches only 11%.
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In this category, then, the advantage of the new lens over the old is clear.
The picture below shows the vignetting measurement results for the Nikkor-S 5cm f/2.0 wide open.
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